separate PRE_LIBRUBY_UPDATE
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62447 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
separate PRE_LIBRUBY_UPDATE
definitions without miniruby.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62447 b2dd03c8-39d4-4d8f-98ff-823fe69b080e